[committed] libstdc++: Fix redundant assignment (PR 94629)

[Jonathan Wakely]

This appears to be a copy&paste error, which cppcheck diagnoses.

	PR other/94629
	* include/debug/formatter.h (_Error_formatter::_Parameter): Fix
	redundant assignment in constructor.

Tested powerpc64le-linux, committed to master.

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commit a2c0fa35d0dc8912b0c1a658234221de61e60840
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Sun Apr 19 20:54:38 2020 +0100

    libstdc++: Fix redundant assignment (PR 94629)
    
    This appears to be a copy&paste error, which cppcheck diagnoses.
    
            PR other/94629
            * include/debug/formatter.h (_Error_formatter::_Parameter): Fix
            redundant assignment in constructor.

diff --git a/libstdc++-v3/include/debug/formatter.h b/libstdc++-v3/include/debug/formatter.h
index 998f8056601..bb9b3e5653a 100644
--- a/libstdc++-v3/include/debug/formatter.h
+++ b/libstdc++-v3/include/debug/formatter.h
@@ -299,7 +299,6 @@ namespace __gnu_debug
 	  _M_variant._M_iterator._M_name = __name;
 	  _M_variant._M_iterator._M_address = std::__addressof(__it);
 	  _M_variant._M_iterator._M_type = _GLIBCXX_TYPEID(_Iterator);
-	  _M_variant._M_iterator._M_constness =
 	  _M_variant._M_iterator._M_constness =
 	    __it._S_constant() ? __const_iterator : __mutable_iterator;
 	  _M_variant._M_iterator._M_sequence = __it._M_get_sequence();